I can relate, Nanners! The lower I go, the worse I get, as far as being grumpy goes. I am currently at 5 mg and it is worse than when I was at 10 last week. I find myself apologizing a whole lot more when I am on the pred. It is awful! I usually try to "sugar coat" things but lately, I have been telling people like it is.
I have found even the smallest things will irk me and once I get to a certain degree of being upset, I am pretty much upset the rest of the day. Oh man, It is NOT fun! Acting like this is so NOT ME either!
Sometimes, I don't even want to be around myself....bad huh!